Method of coating a transfer device



Sept. 1940- 1.. c, ANTRIM I 2,213,644

METHOD OF COATING A TRANSFER DEF VICE Filed D60. 13, 1937 UNSIZED &UNCALENDERED PAPER COATED WITH OILSOLUBLE INK CONTAINING INSOLUEaLEPOWDER IMPREGNATED WITH OIL SOLUBLE INK INSOLUBLE POWDER DEPOSIT 0NSURFACES OF PAPER 01L SOLUBLE INK CONTAINING INSOLUBLE POWDER INVENTORATTORNE locals fi-Ahtrim,

Patented Sept. 3, 1940 UNITED-STATES .METHOD OF COATING A TRANSFERDEVICE .Louis C. Antrim, New York, N. Y., assignor to AutographicRegister Company, Hoboken, N. .L, a corporation of New JerseyApplication December 13, 1937, Serial No. 179,436

6 Claims.

quantity of ink'so that the device will last over a considerable periodof time. However, it has been found that such transfer paper willproduce undesirable smudges and will bleed or lose the ink quite rapidlywhen in use. To overcome this difllculty, applicant has devised a newtransfer sheet and a new method for producing the same. so According tothe present invention, a porous sheet is impregnated with an oil-solubleink and is provided with a layer or coating in intimate contact with thesheet providing a porous cover for the sheet which will effectively con-95 trol the amount of ink permitted to leave the paper when animpression is made from the paper, and which will prevent smudges due toex'- cessive ink on the surfaces of the paper. Y

The layer or porous cover is composed of finely 80 divided materialwhich is insoluble in the ink solution and which is also incapable ofchemical reaction with the constituents of the ink. This materialadheres firmly to the paper and is retained thereby for subtsantiallythe life of the 85 paper.

The invention also provides a novel method of producing the paperwhereby the paper is simultaneous'ly impregnated with the inksolutionand coated with the finely divided ink-retarding ma-.

40 terial. This enables the production of the paper to be efiected veryrapidly.

According to the method of the present invention, the finely dividedmaterial is held in suspension in the ink solution and, as the ink isabsorbed in the paper, the finely divided material will be deposited onthe surface thereof. It will be seen that the deposit will beinproportion to the amount of ink absorbed in the paper so that, when onlya small amount'of ink is ab-- sorbed, only ,a thin coating is formedonthe surface and, conversely, when a large amount of ink is absorbed, thedeposit on the surface'will be thicker. The deposit or layer is slightlyporous u so that it will control the flow of ink from the paper toanother medium when impressions are made therefrom. If desired, one sideof the paper can be rendered nontransferring by.providing it with animpervious coating of lacquer or the like, so that, i when used in atypewriter, the paper will only make one transfer impression.

Other features and advantages of the invention will be apparent from thespecification when considered in connection with the drawing, in 10which:

Figure 1 is a sheet of paper.

Fig. 2 shows a section of the sheets slightly impregnated with the inkand having a thin coating of insoluble powder on the surface.

Fig; 3 shows a section of the paper which is fully impregnated withoil-soluble ink and having a heavy deposit of insoluble powder on thesurface.

Fig. 4 shows a section of the paper which has been fully impregnated andcoated with the finely divided material and having a backing coat oflacquer thereon.

Fig. 5 shows a view of the paper-inking machine.

According to the invention, a paper It! is used as the base material.The paper is unsized'and uncalendered so that it is very porous. It mustbe understood, however, that any type of porous material may be used,according to this invention. The paper is usually wound into a roll IIwhich is mounted on a spindle [2 at the receiving end of an inkingmachine I3. A mixture of oil and pigment or dye I4 is mixed andplaced inthe trough IS. A suitable quantity of finely divided or powderedmaterial, which will not chemically react with the ink solution andwhich is insoluble in the ink solution, is next mixed with the inksolution in the trough l5 so as to be suspended in the inking solution.The solution and powdered material may be completely mixed before beingplaced in the trough ii if desired.

The finely divided material or powder may be a metal such as aluminum orbronze, a metal alloy, a metal oxide such as iron oxide, soap stone,

or the like. For example, iron oxide makes a very effective coatingmaterial for black trans fer paper.

The paper from the roll II is passed over a guide roller l6 and into thesolution in the trough. A guide roller i1 is mounted so as tobepositioned in the trough to hold the material submerged in themixture. As the paper passes through the mixture, it will absorb the inkand 55 on the surface, as shown at 22 in Figs. 2 and 3.

Fig. 2 diagrammatically shows the paper in the condition when the inksolution first contacts it and places alight deposit of the powderedmaterial on the surface. Fig 3 diagrammatically shows the sheet-whenfully impregnated with the ink and coated with the insoluble powderdeposit.

As is indicaEed by these two figures, the amount of powdered materialdeposited on the surface is in proportion to the amount of ink absorbedby the paper. When a small amount of ink is absorbed by the paper, thelight coating of powdered material which is deposited will be sufficientto prevent the paper from smudging or bleeding. However, when a largeramount of ink is absorbed by the paper, to thoroughly saturate the same,the danger of smudging is much greater and a larger amount of coating onthe surface is necessary to prevent the smudging or excessive bleedingof the ink. This will be present because the increased absorption of theink into the paper will be operative to deposit by filtration largerquantities of coating material on the paper, and this will be suflicientto prevent the ink from passing from the paper too freely when used. Theamount of ink absorption and coating can be controlled by the speed atwhich the paper is carried through the solution.

The paper, upon leaving the solution, is passed around a guide roll [8,through a pair of squeezing rollers l9, between a pair of spring-pressedfeed rollers 20 and through a pair of felt-covered rollers 2|. The paperin leaving the tank has the excess ink squeezed therefrom by the rollersl9, which also function to press the powdered material into moreintimate contact with the paper. The layer of finely divided material,when in intimate contact with the paper, will adhere thereto for thelife of the paper without the use of adhesives or other bonding means.

Should there be any unevenness in the coating or any surplus inksolution on the surface of the strip, it will be absorbed and evenlydeposited by the felt rollers 2|. a winding means or other take-updevice (not shown) where it is allowed to dry.

This process produces a transfer. sheet provided with two transfersides, each capable of giving an impression. If desired, one surface ofthe impregnated strip can be rendered nontransferring. This may be donein various ways. For example, a backing material or lacquer 23 can beapplied directly to the paper if the backing material or the lacquer isimpervious to the ink sopaper.

lution. If the material is not completely impervious to the ink solutionor will not properly adhere tos' the paper, a bonding or filler coat canbe first applied to the paper and then the lacquer applied to completethe seal of the back of the This prevents offset impressions when thepaper is used in a typewriter or the like.

Variations and modifications may be made within the scope of.thisinvention and portions of the improvements used without others.

I claim:

1. The method of making a transfer device for repeated manifolding use,of the kind in cluding an absorbent paper impregnated with an inkingsolution, which consists in mixing with theinking solution a quantity ofpowder of the class including powdered metal, powdered alloy, andpowdered metal oxide to cause suspension of said powder in saidsolution; immersing the The strip is then led to absorbent paper in themixture of inking solution and powder to cause simultaneous absorptionof the inking solution by the paper and precipitation of the powder fromthe inking solution onto the surface, of the paper to form a coatingthereon comprised solely of a layer of said powder still pulverousexcept as wetted by said solution; prolonging the time of such immersionuntil the desired thickness of wetted pulverous coating is obtained onsaid surface; and removing the paper from such immersion when thedesired thickness of coating is obtained on said surface. I

2. The method of making a transfer device for repeated manifolding use,of the kind including an absorbent paper impregnated with an inkingsolution, which consists in mixing with the inking solution a quantityof metallic powder to cause suspension of said powder in said solution;immersing the absorbent paper in the mixture of inking solution andmetallic powder to cause simultaneous absorption of the inking solutionby the paper and precipitation of the powder from the inking solutiononto the surface of a paper to form a coating thereon comprised solelyof a layer of said powder still pulverous except as wetted by saidsolution; prolonging the time of such immersion until the desiredthickness of wetted pulverous coating is obtained on said surface; andremoving the paper from such immersion when the desired thickness ofcoating is obtained on said surface.

3. In the method of making a transfer device for repeated manifoldinguse, which device comprises a sheet of absorbent paper impregnated withan inking solution and covered at a transfer surface with a coating ofmetallic powder still pulverous except as wetted by said solution andacting to partially choke the pores of the paper and regulate thequantity of ink solution given off during a transfer operation, the stepof insuring that said coating will correspond in degree of thickness tothe degree of absorption of inking solution by the paper; said stepconsisting of adding said powder to and mixing the same with said inkingsolution and while said inking solution carries said added powder in suspension therein bringing the paper into absorptive relation to saidsolution, thereby to insure that as impregnation of the paper with saidsolution proceeds the powder suspended in the soluing solution aquantity of powdered alloy to cause suspension of said powder in saidsolution; immersing the absorbent paper in the mixture of inkingsolution and powdered alloy to cause simultaneous absorption of theinking solution by the paper and precipitation of the powder from theinking solution onto the surface of the paper to form a coating thereoncomprised solely of a layer of said powder still pulverous except aswetted by said solution; prolonging the time of such immersion until thedesired thickness of wetted pulverous coating is obtained on saidsurface; and removing the paper from such immersion when the desiredthickness of coating is obtained on said surface.

5. The method of making a transfer device for repeated maniiolding use,oi. the kind including/ an absorbent paper impregnated with an inkingsolution, which consists in mixing with the inking solution a quantityof powdered metal oxide to cause suspension or said powder in saidsolution; immersing the absorbent paper in the mixture of inkingsolution and powdered metal oxide to cause simultaneous absorption 0!the inking solution by the paper and precipitation of the powder fromthe inking solution onto the surface of the paper to form acoatingthereon comprised solely of a layer of said. powder stillpulverous except as wetted by said solution; prolonging the time of suchimmersion until the desired thickness 01 wetted pulverous coating isobtained on said surface; and removing the paper from such immersionwhen the desired thickness 0! coating is obtained on said surface.

6. The method of making a transfer device for repeated manitolding use,of the kind including an absorbent paper impregnated with an inkingsolution, which consists in mixing with the inking solution a quantityof powdered iron oxide to cause suspension oi said powder in saidsolution; immersing the absorbent paper in the mixture of inkingsolution and powdered iron oxide to cause simultaneous absorption of theinking solution by the paper and precipitation oithe powder from theinkingsolution onto the surface"oi the paper to form a coating thereoncomprised solely of a layer of said powder still pulverous except aswetted by said solution; prolonging. the time of such immersion untilthe desired thickness oi wetted pulverous coating is obtained on saidsurface; and removing the paper from such immersion when the desiredthickness of coating is obtained on said surface.

LOUIS C. AN'I'RIM.

